Abstract. In this paper a common-gate LNA is presented, which is used in a low-power IEEE 802.15.4 receiver with severer requirements on the current consumption. The LNA is designed in a 0.25 μm CMOS technology and consumes only 831 μA. The LNA achieves a voltage gain of 12.89 dB, a NF of 4.86 dB, and an IIP3 of −6.0 dBm.

In this paper, the performance limitation of common-gate LNAs (CG-LNAs) caused by short channel effects is presented. The analysis is based on equations, which describes the behavior of the MOSFET including the noise sources in all possible regions of operation. From these equations, the input time constant τin is defined as one characteristic performance figure of the used CMOS technology. The bias dependent limitation of the noise figure N F and minimum input reflection coefficient min (S 11,dB ) is derived in dependence of τin. The paper shows furthermore the advantage of biasing the CG-LNA in the moderate inversion region.

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